In the US, service charges are usually not included in the bill.  Waitresses and taxi cab drivers are usually tipped 15-20% of the bill.  Some people also tip barbers and hair stylists a dollar or two.  If you do not carry your own luggage, bellboys and porters receive $1.00 for each piece of luggage.  No tips are given to theater ushers, airline personnel, gas station attendants, or "baggers" in grocery stores.

University News
October 20, 2016
The Comparison Project will present the third event in its 2016–2017 series on death and dying. A community interfaith dialogue on Oct. 27 will feature representatives of three different refugee religions in Des Moines.